Herschel's new discoveries, which have been carried further and extended by our young naturalist, are very beautifully connected with that observation which I have frequently told you ofthat Bolognian phosphorus does not receive any light on the yellow-red side of the spectrum, but certainly does so on the blue-red side.

[G.]; [chemical substances giving off light without burning] phosphorus, yellow phosphorus; scintillator, phosphor; firefly luminescence.